CN212508821U

CN212508821U - Oil-free scroll compressor

Info

Publication number: CN212508821U
Application number: CN202020519276.1U
Authority: CN
Inventors: 徐兆鹏; 杨旭
Original assignee: Xi'an Industrial Research Siyuan New Energy Power Technology Co ltd
Current assignee: Dalian Uc S&t Co ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2021-02-09
Anticipated expiration: 2030-04-10

Abstract

The utility model discloses an oil-free scroll compressor, which comprises a frame, the drive mechanism of setting in the frame, the compressing mechanism who is connected with drive mechanism, the air intake mechanism and the exhaust mechanism that link to each other with compressing mechanism respectively and set up the rotation prevention mechanism at the compressing mechanism circumferencial direction, compressing mechanism is including moving the whirlpool dish and with the quiet whirlpool dish that moves whirlpool dish engaged with, it includes the moving vortex circle top to move the whirlpool dish, the moving vortex circle top includes first correction circular arc, first connection circular arc and set up the first straight line between first correction circular arc and first connection circular arc, quiet whirlpool dish includes quiet whirlpool circle top, quiet whirlpool circle top includes the second and revises the circular arc, the second is connected the circular arc and is set up the second straight line between second correction circular arc and second connection circular arc. The utility model discloses a compressor can increase the thickness at the vortex circle top under the condition that does not influence internal compression ratio, improves the intensity and the rigidity at vortex dish top, reduces the invalid volume of exhaust.

Description

Oil-free scroll compressor

Technical Field

The utility model relates to a positive displacement supercharging device field, in particular to oil-free scroll compressor.

Background

The oil-free volumetric compressor is a supercharging device which is not directly contacted with lubricating oil by compressed working medium gas in the working process, can provide high-pressure gas with high cleanliness for specific application occasions, and is a preferred machine type of the oil-free volumetric supercharging device in the current medium and small flow range by virtue of the unique structural form and the operation principle of the oil-free scroll compressor.

Since the gas medium in the working chamber of the oil-free scroll compressor does not directly contact with the lubricating oil during the whole operation, new requirements are put on the lubrication, cooling and strength of the running parts of the compressor.

Firstly, in the working process of an oil-free scroll compressor, the pressure and the temperature of a working cavity are gradually increased from the outer side to the center of a scroll plate, the temperature of the scroll plate close to the center of the scroll plate is much higher than the oil working condition due to the fact that the cooling effect of lubricating oil is not provided, the stress and the thermal deformation of the scroll plate are larger, in order to guarantee the reliable operation of the compressor, the initial end part of the scroll plate close to the center of the scroll plate needs to be corrected to increase the thickness of the initial end of the scroll plate, and the strength and the rigidity of the initial end part of the scroll plate are improved. The current adopted correction mode is a symmetrical circular arc mode, namely two circular arcs are adopted to replace the initial end of the vortex ring, however, by adopting the correction mode, in order to achieve larger thickness of the initial end of the vortex ring, a larger correction angle is required, and the reduction of the internal compression ratio can be caused.

Secondly, the exhaust port of the oil-free scroll compressor is arranged near the center of the fixed scroll, the design of the exhaust port has the characteristics of small exhaust resistance, good processing technology, small ineffective exhaust volume and the like, the currently adopted exhaust port is a circular exhaust port, however, the circular exhaust port is adopted under the limitation of scroll parameters, and under the condition of meeting the requirement of a certain orifice circulation area, larger ineffective exhaust volume can be caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oil-free scroll compressor to the above-mentioned defect among the prior art, the thickness at this compressor multiplicable vortex circle top improves the intensity and the rigidity at vortex circle top, and the influence of internal compression ratio is little.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: the utility model provides an oil-free scroll compressor, is in including frame, setting drive mechanism in the frame, with drive mechanism connect compression mechanism, respectively with air intake mechanism and exhaust mechanism that compression mechanism links to each other and set up at the anti rotation mechanism of compression mechanism circumferencial direction, compression mechanism including move vortex dish and with move the quiet vortex dish that vortex dish engaged with, it is including moving the vortex dish, it includes first correction circular arc, first connection circular arc and sets up to move the vortex dish first correction circular arc with first straight line between the circular arc of first connection, quiet vortex dish includes quiet vortex dish top, quiet vortex dish top includes that the second revises circular arc, second connection circular arc and sets up the second revises the circular arc with second straight line between the circular arc is connected to the second.

Furthermore, the utility model discloses still include following subsidiary technical scheme:

the movable scroll comprises a movable scroll ring, the movable scroll ring is an involute profile of a circle, and the movable scroll ring comprises a movable scroll ring starting end, a first involute and a second involute, wherein the first involute and the second involute are connected with the movable scroll ring starting end.

The fixed scroll comprises a fixed scroll ring, the fixed scroll ring is an involute profile of a circle, and the fixed scroll comprises a fixed scroll initial end, and a third involute and a fourth involute which are connected with the fixed scroll initial end.

The first straight line is tangent to the first correction arc and the first connection arc respectively, the first correction arc is connected with the first involute, and the first connection arc is connected with the second involute.

The second straight line is tangent to the second correction arc and the second connection arc respectively, the second correction arc is connected with the fourth involute, and the second connection arc is connected with the third involute.

The exhaust mechanism comprises an exhaust port, and the exhaust port is waist-shaped with unequal arc radiuses.

The exhaust port comprises a large arc, a small arc, a first straight line section and a second straight line section, wherein the first straight line section and the second straight line section are respectively tangent to the large arc and the small arc, and the first straight line section and the second straight line section are symmetrical by taking the central connecting line of the large arc and the small arc as a symmetrical line.

The radius of the large arc is larger than that of the small arc, the radius of the small arc is equal to that of the second connecting arc, and the first straight line segment is overlapped with the second straight line.

The static vortex disc comprises a static vortex disc base plate, and the exhaust port is formed in the static vortex disc base plate.

The compression mechanism further comprises a movable scroll cover plate connected with the transmission mechanism, and the movable scroll is fixed on the movable scroll cover plate.

Compared with the prior art, the utility model discloses the advantage lies in:

1. the initial end of the scroll adopts the arc and straight line correction, the thickness of the initial end of the scroll is increased, the strength and the rigidity of the initial end of the scroll are improved, and the influence on the internal compression ratio is small.

2. And the waist-shaped exhaust port is adopted, so that the invalid exhaust volume can be effectively reduced.

Drawings

Fig. 1 is a schematic structural view of the oil-free scroll compressor of the present invention.

Fig. 2 is a schematic view of the connection of the components of the oil-free scroll compressor of the present invention.

Fig. 3 is a view showing the engagement of the scroll of the oil-free scroll compressor of the present invention.

Fig. 4 is a structural view of the movable scroll of the oilless scroll compressor of the present invention.

Fig. 5 is a schematic structural view of the fixed scroll and the exhaust port of the oil-free scroll compressor of the present invention.

Fig. 6 is a cross-sectional view taken along a-a of fig. 2.

Fig. 7 is an enlarged view of B in fig. 2.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings.

As shown in fig. 1, the oil-free scroll compressor according to the preferred embodiment of the present invention includes a frame 1, a transmission mechanism 2 disposed in the frame 1, a compression mechanism 3 rotatably connected to the transmission mechanism 2, an air inlet valve 5 and an air outlet mechanism 4 respectively connected to the compression mechanism 3, and an anti-rotation mechanism 6 disposed in the circumferential direction of the compression mechanism 3.

As shown in fig. 2, the transmission mechanism 2 includes an eccentric shaft 10, the eccentric shaft 10 includes an eccentric shaft top 100 connected to a motor (not shown), a shaft body 101 and an eccentric shaft end 102 rotatably connected to the compressing mechanism 3, the shaft body 101 is provided with a first step 103 and a second step 104; the transmission mechanism 2 further comprises a main balance weight 8 arranged at the top end 100 of the eccentric shaft, an auxiliary balance weight 12 arranged at the tail end 102 of the eccentric shaft, an auxiliary bearing 9 sleeved on the shaft body 101 and abutting against the first step 103, and a main bearing 11 sleeved on the shaft body 101 and abutting against the second step 104, wherein the auxiliary bearing 9 and the main bearing 10 are both arranged in the frame 1 and are in close contact with the frame 1. Preferably, both the main bearing 10 and the secondary bearing 9 are lubricated with grease.

As shown in fig. 2 and 3, the compressing mechanism 3 includes a orbiting plate bearing 13 disposed at the end 102 of the eccentric shaft, an orbiting scroll cover plate 14 tightly fitted over the orbiting plate bearing 13, an orbiting scroll 15 fixed on the orbiting scroll cover plate 14, and a fixed scroll 18 engaged with the orbiting scroll 15, the center of the orbiting scroll 15 has a certain eccentricity with respect to the center of the fixed scroll 18, and the turning radius of the orbiting scroll 15 is equal to the eccentricity of the eccentric shaft 10; the movable scroll 15 comprises a movable scroll ring 16, the fixed scroll 18 comprises a fixed scroll ring 19 and a fixed scroll base plate 180, the movable scroll ring 16 and the fixed scroll ring 19 are both of circular involute profiles, and the phase angles of the profiles of the movable scroll ring 16 and the fixed scroll ring 19 are different by 180 degrees in the same cross section; the movable scroll ring 16 and the fixed scroll ring 19 are engaged with each other to form a plurality of pairs of crescent working chambers 40, the size of the working chambers 40 is changed by the rotation of the movable scroll 15, and gas is compressed by the change of the working chambers 40; the compression mechanism 3 further comprises a first sealing strip 17 arranged at the top end of the movable scroll 16 and a second sealing strip 20 arranged at the top end of the fixed scroll 19, and the first sealing strip 17 and the second sealing strip 20 are made of multifunctional wear-resistant plastics. Preferably, the movable disc bearing 13 is lubricated with grease.

The start ends of the moving and

static scrolls

16 and 19 adopt the same correction mode, namely a correction mode of symmetrical circular arcs and straight lines.

As shown in fig. 4, the movable scroll 16 includes a movable scroll start 160 and a first involute 164 and a second involute 165 connected to the movable scroll start 160, the movable scroll start 160 includes a first modified arc 161, a first connecting arc 163, and a first straight line 162 tangent to the first modified arc 161 and the first connecting arc 163, respectively, the first modified arc 161 is tangent to the first involute 164, and the first connecting arc (163) is tangent to the second involute 165.

As shown in fig. 5, the fixed wrap 19 includes a fixed scroll start end 190, and a third involute 195 and a fourth involute 196 connected to the fixed scroll start end 190, the fixed scroll start end 190 includes a second modified arc 191, a second connecting arc 193, and a second straight line 192 tangent to the second modified arc 191 and the second connecting arc 193, respectively, the second modified arc 191 is tangent to the fourth involute 196, and the second connecting arc 193 is tangent to the third involute 195.

When the initial end of the scroll is corrected in a symmetrical arc mode, in order to increase the thickness of the initial end of the scroll, a correction angle needs to be increased, the minimum enclosed working volume of the compressor can be increased, and the internal compression ratio can be reduced; and the start end of the scroll is corrected by adopting a correction mode of symmetrical circular arc plus straight line, so that the influence of a smaller minimum closed working volume can be obtained while the wall thickness of the start end of the scroll is larger, and the influence on the internal compression ratio of the compressor is smaller compared with the correction mode of symmetrical circular arc.

The air inlet mechanism 5 comprises an air inlet 22 connected with the fixed scroll 18, wherein the air inlet 22 is cylindrical and is fixed on the bottom surface 180 of the fixed scroll through a hexagon socket screw 7.

As shown in fig. 3 and 5, the discharge port 21 is disposed at the center of the fixed scroll base plate 180, the discharge port 21 is shaped like a kidney with unequal arc radii, and includes a large arc 210, a small arc 213, and a first straight line segment 211 and a second straight line segment 212 respectively tangent to the large arc 210 and the small arc 213, the large arc 210 has a radius larger than that of the small arc 213, the first straight line segment 211 and the second straight line segment 212 are symmetrical about a line connecting the centers of the large arc 210 and the small arc 213, the small arc 213 has a radius equal to that of the second connecting arc 193, and the first straight line segment 211 and the second straight line 192 coincide with each other. The shape design scheme of the exhaust port 21 has a good processing technology, simultaneously reasonably utilizes the shape of the initial end of the vortex ring, has a large exhaust area, can exhaust gas quickly when the exhaust starts, reduces the exhaust resistance, and when each exhaust cycle of the compressor is finished, the position of the first straight line 162 of the correction section of the movable vortex ring 16 coincides with the position of the second straight line 192 of the correction section of the fixed vortex ring 19, and no residual high-pressure sealing volume exists between the movable vortex ring 16 and the fixed vortex ring 19, so that the exhaust ineffective volume can be reduced.

As shown in fig. 6 and 7, rotation preventing mechanism 6 includes a plurality of rotation preventing assemblies 60 provided in the circumferential direction of orbiting scroll cover plate 14, and preferably, 3 rotation preventing assemblies 60 are provided in the present embodiment. Each anti-rotation assembly 60 includes a crank shaft 23, an upper bearing set 24 installed between the orbiting scroll cover plate 14 and the crank shaft 23, a lower bearing set 25 installed between the frame 1 and the crank shaft 23, an upper pressing assembly 30 and a lower pressing assembly 31, the upper pressing assembly 30 fixedly presses the upper bearing set 24 in the orbiting scroll cover plate 14, and the lower pressing assembly 31 fixedly presses the lower bearing set 25 in the frame 1.

Upper clamping assembly 30 includes a small cover plate 26 mounted at one end of upper bearing set 24, and small cover plate 26 is secured to orbiting scroll cover plate 14 by first screws 32.

The lower pressing component comprises a large cover plate 27 arranged at one end of the lower bearing group, an outer cover plate 29 arranged at the other end of the lower bearing group and a pressing cover plate 28 arranged between the lower bearing group 25 and the outer cover plate 29, the large cover plate is fixed in the machine frame 1 through a second screw 33, the outer cover plate 29 is fixed on the machine frame 1 through a third screw 34, and the pressing cover plate 28 is fixed on the crank shaft 23 through a hexagonal pressing screw 35.

The orbiting scroll cover plate 14 is provided with 3 concave holes 140 along the circumferential direction, a boss 141 is arranged in the concave hole 140, and the frame 1 is provided with 3 through holes 1-1.

The crank shaft 23 includes a first crank section 230 installed in the mounting recess hole 140 and a second crank section 231 installed in the through hole 1-1, and the eccentricity of the crank shaft 23 is equal to the revolution radius of the orbiting scroll 15.

The upper bearing set 24 is installed in the concave hole 140 and is in close contact with the concave hole 140, the upper bearing set 24 comprises a first upper bearing 240 and a second upper bearing 241 which are tightly sleeved on the first crank section 230, and the first upper bearing 240 and the second upper bearing 241 are installed in a face-to-face mode; the lower bearing set 25 is installed in the through hole 1-1 and is in close contact with the through hole 1-1, the lower bearing set 25 comprises a first lower bearing 250 and a second lower bearing 251 which are tightly sleeved on the second crank section 231, the first lower bearing 250 and the second lower bearing 251 are installed in a back-to-back mode, and the first upper bearing 240, the second upper bearing 241, the first lower bearing 250 and the second lower bearing 251 are lubricated by grease.

First crank axle 230 is provided with first step 232, upper bearing set 24 includes first axial face 242, second inner axial face 243 and second outer circumferential face 244, upper bearing set 24 is disposed between orbiting scroll cover plate 14 and first crank section 230, first axial face 242 of upper bearing set 24 abuts boss 141, second inner axial face 243 abuts first step 232, and second outer circumferential face 244 abuts small cover plate 26; the second crank section 231 is provided with a second step 233, the lower bearing set 25 comprises a third inner axial surface 252, a third outer axial surface 253, a fourth inner axial surface 254 and a fourth outer axial surface 255, the lower bearing set 25 is arranged between the frame 1 and the second crank section 231, the third inner axial surface 252 of the lower bearing set 25 tightly abuts against the second step 233, the third outer axial surface 253 tightly abuts against the large cover plate 28, the fourth inner axial surface 254 tightly abuts against the pressing cover plate 28, and the fourth outer axial surface 255 tightly abuts against the outer cover plate 29.

When the movable scroll 15 has the tendency of rotation, because the circumferential direction of the movable scroll 15 is provided with 3 completely same rotation-preventing assemblies 60, and the relative positions of the rotation-preventing assemblies are fixed, because the second crank section 231 of the rotation-preventing mechanism 6 is fixed in the frame 1, the second crank section 231 can only rotate in situ and can not generate circumferential angular displacement, the first crank section 230 is tightly arranged in the movable scroll cover plate 14 through the upper bearing group 24, the movable scroll cover plate 14 can not generate circumferential angular displacement and can not rotate because of being limited by three crank shafts 23 at the same time, and the eccentricity of the three crank shafts 23 is equal to the turning radius of the movable scroll 15, namely the eccentricity of the eccentric shaft 10, therefore, the movable scroll cover plate 14 can only revolve around the turning center of the eccentric shaft 10, namely, do translational motion, the movable scroll cover plate 14 is fixedly connected with the movable scroll 15, and the movable scroll 15 moves along with the movable scroll cover plate 14, therefore, the rotary mechanism can only do translational rotary motion along the original path and cannot rotate.

Since rotation preventing mechanism 6 is provided in concave hole 140 of orbiting scroll cover plate 14, lubricating oil can be stored only in concave hole 140 and cannot be dropped into working chamber 40 to come into gas contact with working chamber 40.

The utility model has the advantages that:

3. The autorotation prevention mechanism can effectively prevent the movable scroll from autorotation.

4. The anti-rotation mechanism can prevent the gas in the working cavity from directly contacting with the lubricating oil under the condition of reliable lubrication, and improves the cleanliness of the gas medium.

It should be noted that the above-mentioned preferred embodiments are only for illustrating the technical concepts and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, and the protection scope of the present invention cannot be limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides an oil-free scroll compressor, is in including frame (1), setting drive mechanism (2) in frame (1), with drive mechanism (2) rotate compressing mechanism (3) of connecting, respectively with air intake mechanism (5) and exhaust mechanism (4) that compressing mechanism (3) link to each other and set up at compressing mechanism (3) circumferencial direction prevent rotation mechanism (6), its characterized in that: the compression mechanism (3) includes an orbiting scroll (15) and a non-orbiting scroll (18) engaged with the orbiting scroll (15), the orbiting scroll (15) includes an orbiting wrap start end (160), the orbiting wrap start end (160) includes a first correction arc (161), a first connection arc (163), and a first straight line (162) disposed between the first correction arc (161) and the first connection arc (163), the non-orbiting scroll (18) includes a non-orbiting scroll start end (190), the non-orbiting scroll start end (190) includes a second correction arc (191), a second connection arc (193), and a second straight line (192) disposed between the second correction arc (191) and the second connection arc (193).

2. An oil-free scroll compressor as claimed in claim 1, wherein: the movable scroll (15) comprises a movable scroll ring (16), the movable scroll ring (16) is an involute profile of a circle, and the movable scroll ring (16) comprises a movable scroll ring starting end (160), a first involute (164) and a second involute (165) which are connected with the movable scroll ring starting end (160).

3. An oil-free scroll compressor as claimed in claim 1, wherein: the fixed scroll (18) comprises a fixed scroll ring (19), the fixed scroll ring (19) is an involute profile of a circle, and the fixed scroll (18) comprises a fixed scroll initial end (190), a third involute (195) and a fourth involute (196) which are connected with the fixed scroll initial end (190).

4. An oil-free scroll compressor as claimed in claim 2, wherein: the first straight line (162) is tangent to the first correction arc (161) and the first connection arc (163) respectively, the first correction arc (161) is connected with the first involute (164), and the first connection arc (163) is connected with the second involute (165).

5. An oil-free scroll compressor as claimed in claim 3, wherein: the second straight line (192) is tangent to the second correction arc (191) and the second connection arc (193) respectively, the second correction arc (191) is connected with the fourth involute (196), and the second connection arc (193) is connected with the third involute (195).

6. An oil-free scroll compressor as claimed in claim 1, wherein: the exhaust mechanism (4) comprises an exhaust port (21), and the exhaust port (21) is kidney-shaped with unequal arc radiuses.

7. An oil-free scroll compressor as claimed in claim 6, wherein: the exhaust port (21) comprises a large arc (210), a small arc (213) and a first straight line section (211) and a second straight line section (212) which are respectively tangent to the large arc (210) and the small arc (213), and the first straight line section (211) and the second straight line section (212) are symmetrical by taking the central connecting line of the large arc (210) and the small arc (213) as a symmetrical line.

8. An oil-free scroll compressor as claimed in claim 7, wherein: the radius of the small circular arc (213) is equal to the radius of the second connecting circular arc (193), and the first straight line segment (211) coincides with the second straight line (192).

9. An oil-free scroll compressor as claimed in claim 6, wherein: the fixed scroll (18) includes a fixed scroll base plate (180), and the exhaust port (21) is opened on the fixed scroll base plate (180).

10. An oil-free scroll compressor as claimed in claim 1, wherein: the compression mechanism (3) further comprises a movable scroll cover plate (14) connected with the transmission mechanism (2), and the movable scroll (15) is fixed on the movable scroll cover plate (14).